Reconstructing the Geomagnetic Field in West Africa: First Absolute Intensity Results from Burkina Faso

被引:17
|
作者
Kapper, Lisa [1 ]
Donadini, Fabio [2 ,4 ]
Serneels, Vincent [2 ]
Tema, Evdokia [3 ]
Goguitchaichvili, Avto [1 ]
Julio Morales, Juan [1 ]
机构
[1] Natl Autonomous Univ Mexico UNAM, Inst Geophys, Natl Archeomagnet Serv, Campus Morelia, Morelia, Michoacan 58190, Mexico
[2] Univ Fribourg, CH-1700 Fribourg, Switzerland
[3] Univ Turin, Dipartimento Sci Terra, I-10125 Turin, Italy
[4] Materialtech Bau AG, G bigasse 3, CH-5107 Schinznach Dorf, Switzerland
来源
SCIENTIFIC REPORTS | 2017年 / 7卷
关键词
EARTHS MAGNETIC-FIELD; REMANENCE ANISOTROPY; ARCHEOINTENSITY DATA; CALIBRATION CURVES; PALEOINTENSITY; INTCAL09; POTTERY; EUROPE; BRICKS; KILNS;
D O I
10.1038/srep45225
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We present absolute geomagnetic intensities from iron smelting furnaces discovered at the metallurgical site of Korsimoro, Burkina Faso. Up to now, archaeologists recognized four different types of furnaces based on different construction methods, which were related to four subsequent time periods. Additionally, radiocarbon ages obtained from charcoal confine the studied furnaces to ages ranging from 700-1700 AD, in good agreement with the archaeologically determined time periods for each type of furnace. Archaeointensity results reveal three main groups of Arai diagrams. The first two groups contain specimens with either linear Arai diagrams, or slightly curved diagrams or two phases of magnetization. The third group encompasses specimens with strong zigzag or curvature in their Arai diagrams. Specimens of the first two groups were accepted after applying selection criteria to guarantee the high quality of the results. Our data compared to palaeosecular variation curves show a similar decreasing trend between 900-1500 AD. However, they reveal larger amplitudes at around 800 AD and 1650 AD than the reference curves and geomagnetic field models. Furthermore, they agree well with archaeomagnetic data from Mali and Senegal around 800 AD and with volcanic data around 1700 AD.
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页数:12
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